<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <script>
        //  ...  把伪数组变成真正的数组
        let oDivs = document.getElementsByTagName('div');
        let newDivs = [...oDivs];
        console.log(oDivs);
        //oDivs.push(1);  //报错
        //console.log(oDivs);


        // console.log(newDivs);
        newDivs.push(1);
        console.log(newDivs); //[div,div,div,div,1]
    </script>
</body>

</html>